Composition for treating fibrous material



UNITED STATES PATENT OFFICE.

WILLIAM D. PLEDGE, OF TRENTON, NEW JERSEY, ASSIGNOR T0 THERMOID RUBBER. COMPANY, OF TRENTON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

COMPOSITION FOR TREATING FIIBROUS MATERIAL.

No Drawing. Original application filed March 16, 1917, Serial No. 155,330. Divided and filed June 13, 1917.

To all whom 2'1 may concern:

Be it known that I, IVILLIAM D. PAlRDOE, a citizen of the United States, and a resident of Trenton, Mercer county, State of New Jersey, have invented a omposition for Treating Fibrous Material, (being a division of my application for patent, filed March 16, 1917, Serial Number 155,330,) of which the following is a specification.

One object of my invention is to provide a novel composition for treating the linings of clutches, brakes and like devices in order that such lining shall be capable of withstanding the stresses placed upon it under operating conditions, shall possess a good wearing surface and be of such a nature as not likely to be damaged by over heating.

In carrying out my invention I provide a mixture which in a typical case may consist of twenty-six ounces of asphalt, four ounces of red lead, five ounces of sulfur, two ounces of hexamethylenetetramin in two thousand eight hundred and forty c. c. of gasolene and three hundred and fifty c. c. of benzol. The woven or braided cloth or tape to be treated, which may be made of flax, hemp, asbestos or other fibrous material, is placed in this mixture for a time sufiicient to permit it to be completely impregnated or saturated, after which it is removed from the mixture, thoroughly dried, and subjected to a relatively high pressure such as fifteen hundred pounds to the square inch, being at the same time heated to a temperature of from 300 to 400 F.

As a result of this treatment the materials in the fabric are vulcanized to a greater or less extent and the quantity of fixed carbon therein is materially increased, so that the finished product has an unusually high coefiicient of friction, possesses good wearing qualities, and will not become sticky when subjected to the heat to which it is frequeniliy exposed under operating conditions. oreover the finished product produced as above described is hard, unaffected by oil and heat, and is as nearly uninflammable as it is possible to make. It is noted that the substance referred to above as asphalt is preferably the mineral compound known as gilsonlte, in an oxidized or blown form, although other hydrocarbons of an asphaltic nature may be employed without departing from my invention.

Patented Oct. 5, 1920.

this application Serial No. 174,569.

The hexamethylenetetramin is employed to accelerate the vulcanization of the mate rials with which the fabric base is impreghated and while it may be replaced by other substances which hasten vulcanization. I prefer to employ it or some other amin such as para-phenylenediamin, tetramethylenedi amin, naphthylenediamin. Obviously other lead oxids besides red lead might be used but I have found the latter to give the bestresults. Again, some liquid other than a mixture of gasolene and benzol may be used with the materials specified, such for ex" ample as carbon bisulfid or carbon tetrachlorid, but I preferably utilize the substances specified.

It is to be noted that the lead oxid and hexamethylenetetramin may be altogether omitted in some cases although I have found them to be particularly valuable in materially hastening the vulcanizing or oxidizing operation.

I claim 1. The composition for treating fibrous material for use in the manufacture of brake linings possessing a high coefficient of friction which consists of a hydrocarbon of asphaltic nature; a metallic oxid; sulfur; a vulcanization accelerator; and a solvent liquid for certain of said substances.

2. The composition for treating fibrous material for use in the manufacture of brake linings which consists of asphalt; a metallic oxid; sulfur; a vulcanization accelerator; and a solvent liquid for certain of said substances.

3. The composition for treating fibrous material for use in the manufacture of brake linings which consists of blown gilsonite; a metallic oxid; sulfur; a vulcanization accelerator; and a solvent liquid for certain of said substances.

4. The composition for treating fibrous material for use in the manufacture of brake linings which consists of asphalt; lead oxid; sulfur; a vulcanization accelerator; and a solvent liquid for certain of said substances.

5. The composition for treating fibrous material for use in the manufacture of brake linings which consists of asphalt; lead oxid; sulfur; an amin; and a solvent liquid for certain of said substances.

6. The composition for treating fibrous material for use in the manufacture of brake linings which consists of asphalt; lead oxid; sulfur; hexamcthylenetetramin; and a solvent liquid for certain of said substances.

7. The composition for treating fibrous material which consists of asphalt; red lead; sulfur: hexamethylenetetramin; and a solvent liquid for certain of said substances.

8. The composition for treating fibrous material which consists of asphalt; red lead; sulfur; and hexamethylenetetramin dissolved in a mixture of gasolene and benzol.

9. The composition for treating fibrous material for use in the manufacture ofbrake linings which consists of twenty-six ounces of asphalt; four ounces of red lead; five ounces of sulfur; and two ounces of hexamethyleuetetramin, dissolved in two thousand eight hundred and forty c. c. of gasolene and three hundred and fifty c. c. of

benzol.

10. The composition for treating fibrous material for use in the manufacture of brake linings comprising blown gilsonite and sulfur in a solvent liquid.

In witness whereof I WILLIAM D. PARDOE.

affix my signature. 25 

